function classChange(element,newClass) {
	element.className = newClass;
	}
function appear(idBlock) {
	idBlock.style.visibility="visible";
	}
function disappear(idBlock) {
	idBlock.style.visibility="hidden";
	}

// --------------- dropdownmenu ----------------

var timeout         = 500;
var closetimer		= 0;
var ddmenuitem      = 0;

// open hidden layer
function mopen(id)
{	
	// cancel close timer
	mcancelclosetime();

	// close old layer
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';

	// get new layer and show it
	ddmenuitem = document.getElementById(id);
	ddmenuitem.style.visibility = 'visible';

}
// close showed layer
function mclose()
{
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
}

// go close timer
function mclosetime()
{
	closetimer = window.setTimeout(mclose, timeout);
}

// cancel close timer
function mcancelclosetime()
{
	if(closetimer)
	{
		window.clearTimeout(closetimer);
		closetimer = null;
	}
}

// close layer when click-out
document.onclick = mclose;

// --------------- /dropdownmenu ----------------

// ----------------- showPage.js ----------------
function showPage(pid, bid) {
	var totalNumberOfPages = 10;
	for( p = 1; p <= totalNumberOfPages; p++) {
		if(document.getElementById('page'+p))
		   document.getElementById('page'+p).style.display='none';
	}
	if(document.getElementById('page'+pid))
	   document.getElementById('page'+pid).style.display='block';
	var totalNumberOfButtons = 10;
	for( b = 1; b <= totalNumberOfButtons; b++) {
		if(document.getElementById('button'+b))
		   document.getElementById('button'+b).className='inactive';
	}
	if(document.getElementById('button'+bid))
	   document.getElementById('button'+bid).className='active';
}
// ---------------- /showPage.js ----------------